JP2622892B2 - Construction method of joint material for caisson - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a revetment constructed by arranging a plurality of caissons successively for reclamation of a sea, a lake, or the like, and formed between caissons. The present invention relates to a method for constructing a joint material provided between adjacent caissons in order to prevent earth and sand from flowing out of a gap formed.

[Conventional technology]

When conducting land reclamation work in the sea, etc., a plurality of caissons are laid continuously in series around the sea surface to be reclaimed to construct a revetment wall, and sediment is brought into the sea area surrounded by the revetment wall and landfilled. Do. In such a revetment wall, the caisson is arranged in a line at a certain interval from each other, and the earth and sand used for landfill may be washed out by seawater and flow out of the gap. Therefore, it is necessary to completely seal the joint between caissons in order to prevent such outflow of earth and sand.

Conventionally, for such caisson joint seal,
As shown in JP-A-56-11806, a hollow cylindrical joint material having both ends closed and made of an elastic member such as rubber or synthetic resin is forcibly flattened by extracting internal air and disposed between opposing surfaces of a caisson. After that, the joint material itself is opened by opening the upper end of the joint material and the joint material itself is pressed against the opposing surface of the caisson by the elastic restoring force of the joint material itself. In this type of joint material, a filler such as sand, asphalt, mortar, or the like is injected and filled into a hollow portion of the joint material in order to more closely press the joint material to the opposing surface to strengthen the seal.

Further, as another prior art, as shown in JP-A-61-113913, a filling member formed by burying a tubular body having a large number of holes in a peripheral wall along a longitudinal direction of a water-swellable rubber member. , The filling member can be inserted therein,
There is a joint material formed of a flexible material hollow body having a closed lower end. If this joint material is inserted into the space between the caissons and water is filled in the hollow body whose upper end is closed, the joint between the caisons is sealed using the expansion pressure of the water-swellable rubber member.

[Problems to be solved by the invention]

Recently, large caisson has been developed and used for seawall protection of deep water breakwaters, offshore artificial islands, etc., but sand, asphalt,
Since a joint material filled with a filler such as mortar or the like has a small filling pressure, a sufficient seal may not be obtained when used as such a joint material for a large deep water caisson. Further, the joint material utilizing the swelling pressure of the water-swellable rubber has an excellent sealing function but has a problem of high cost.

The present invention has been made in order to solve the above-mentioned problems of the conventional caisson joint material, and a joint material for a caisson joint material capable of completely and inexpensively realizing a joint seal between large and deep caissons. It is intended to provide a construction method.

[Means and actions for solving the problem]

The construction method of caisson joint material to achieve the above object is
A hollow long cylinder made of a flexible material and opened at the upper end and closed at the lower end is made of a flexible material and connected to the source of pressurized fluid of pressurized water. The pressurized fluid filling long cylinder is provided in a state where fluid such as water is not injected, and this hollow long cylinder is fixed to one side wall of an adjacent caisson, and sand, asphalt,
After injecting and filling a filler such as mortar, a fluid such as water is pressurized and injected into the pressurized fluid filling long cylinder, and the outer surface of the hollow long cylinder is expanded by expanding the pressurized fluid filling long cylinder. The other caisson is pressure-bonded to the opposing side wall surface.

According to the present invention, the outer surface of the hollow long cylinder faces the other caisson by injecting and filling a filler such as sand, asphalt, and mortar into the hollow long cylinder fixed to the side wall of one caisson by the above configuration. The long cylinder for pressurized fluid filling swells by contacting the side wall surface and then injecting a fluid such as water into the long cylinder for pressurized fluid filling, and the bulging pressure causes the outer surface of the hollow long cylinder to expand. It is crimped to the opposing side wall surface of the other caisson.

In one embodiment of the present invention, a plurality of hollow long cylinders are fixed at intervals from each other along the side wall of the caisson, and after filling each hollow long cylinder with a filler in the same manner as described above, each pressurization is performed. The outer surface of each hollow long tube is pressed against the opposite side wall surface of the other caisson by injecting a fluid such as water into the long tube for fluid filling under pressure and expanding the long tube for pressurized fluid filling, and then An impervious layer is formed by injecting and filling a filler such as asphalt mastic into joints between the hollow long cylinders. Thereby, multiple seals are formed by the plurality of hollow long cylinders and the water-impermeable layer, and a more reliable seal structure can be obtained.

In another embodiment of the present invention, in any of the above cases, the hollow long tube is a first long tube fixed to the side wall of one caisson and the first long tube facing the side wall of the other caisson.
The pressurized fluid charging long cylinder is inserted into the second long cylinder. With this configuration, the first long cylinder is filled with a filler such as sand, asphalt, and mortar to perform primary water stoppage. If the joint between the caisson opens for some reason after a while, Filling the filling material such as sand, asphalt, mortar, etc. into the long cylinder of 2, and adding the asphalt mastic etc. to the water-impermeable layer as needed, seal following the expansion of joint space after the joint is completed. It can be performed.

The hollow long cylinder is disposed at the joint between the caissons with its longitudinal direction aligned with the vertical direction of the caisson, and has a length corresponding to the height of the caisson. The hollow long cylinder has an arbitrary cross-sectional shape such as a circle, an ellipse, and a polygon, and its upper end is opened so that the filler can be injected, and the filler such as sand filled therein does not flow out. The lower end is closed to form a bottom wall.

The hollow long cylinder is initially flattened by water pressure when the jointing material is arranged between the opposing surfaces of the caisson, and then changes to the expanded state as the filler is filled, and it is necessary to be pressed against the opposing surface of the caisson There is. For this reason, the hollow long cylinder needs to be formed of a flexible material. As a material satisfying such conditions, rubber or a rubber sheet containing a reinforcing cloth is preferable, but not limited thereto, tarpaulin,
It is also possible to use other materials such as canvas, woven fabric, non-woven fabric and the like. Further, it is preferable to have a watertight structure.

The long cylinder for pressurized fluid filling is provided in the hollow cylinder so as to reach the bottom of the hollow cylinder, and the upper end thereof is connected to a pressurized fluid supply source such as a water supply pump. Have a filling length. The long cylinder for pressurized fluid filling has an arbitrary cross-sectional shape such as a circle and an ellipse. The upper end is opened so that the fluid can be injected under pressure, and the lower end is closed so that the fluid does not flow out. I have.

The pressurized fluid filling long cylinder is in a flattened state in the hollow long cylinder until the fluid is pressurized and injected, changes to an expanded state as the fluid is pressurized and injected, and faces the outer hollow long cylinder. Since it is to be pressed against the surface of a caisson, it is necessary to have flexibility, and it is necessary to have sufficient strength and water tightness to withstand strong pressure received from the pressurized fluid. As a material that satisfies such conditions, a rubber sheet containing a reinforcing cloth, a double cylinder composed of an inner cylinder made of rubber or synthetic resin and an outer cylinder made of a woven fabric, or the like can be used. It is the best material in terms of its function and economy.

Water or air can be practically used as the fluid to be pressurized into the pressurized fluid filling long cylinder, but when filling asphalt mastic with heating and stirring at joints between a plurality of hollow long cylinders, If air is used as the fluid to be pressurized and injected into the pressurized fluid filling long cylinder, there is a risk that the air sealed in the long cylinder may thermally expand and break the long cylinder.
Preferably, water is used.

The hollow long cylinder may be fixed to one surface of the caisson in advance at a factory by an appropriate method such as bolting, or may be fixed to one surface of the caisson at a landfill site. It is convenient to insert the pressurized fluid filling long cylinder in advance into the hollow long cylinder.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

〔Example〕

The attached drawing shows an embodiment in which two hollow long cylinders are arranged at intervals and an impermeable layer is formed by injecting and filling asphalt mastic into the joint between them, and FIG. 1 shows the construction of the joint material. FIG. 2 is a perspective view showing the completed state with a part of the caisson cut away, and FIG. 2 and FIG. 3 are plan sectional views showing the procedure of the construction.

In this embodiment, the joint material 1 is composed of two hollow long cylinders 2,2,
Water-impermeable layer 4 made of asphalt mastic formed between long cylinders 3, 3 for pressurized fluid filling and hollow long cylinders 2, 2
Consists of

Each hollow long cylinder 2 is made of a synthetic rubber reinforced with carbon black, which has aging resistance, seawater resistance, weather resistance, and heat resistance, and is made of a material in which a synthetic fiber is inserted into a central portion of a rubber thickness, and has an elliptical cross section. In the body, the upper end is open and the lower end is closed by a bottom wall made of a rubber sheet. In this embodiment,
As shown in FIG. 2, each hollow long cylinder 2 has a large-diameter primary water stopping long cylinder 2a having a mounting plate 2c for a caisson, and this long cylinder 2a.
Small-diameter secondary water-stop cylinder bonded to the opposite side of the mounting plate 2c
2b. A plurality of stud bolt insertion holes 2d are formed in both sides of the mounting plate 2c in the longitudinal direction.

On the side wall of one caisson 5, stud bolts 6 are embedded in advance at the mounting positions of the hollow long cylinder 2, and the stud bolts 6 are inserted into the respective stud bolt insertion holes 2 d of the mounting portion 2 c of the central long cylinder 2. Mounting plate 2c with nut 8 through 7
Is fixed to the side wall of the caisson 5. (Stud bolts may be welded to the mounting plate 2c in advance).

The long cylinder 3 for pressurized fluid filling is inserted in advance into the long cylinder 2b for secondary water stoppage of the hollow long cylinder 2. In this embodiment, the long cylinder 3 is made of a commercially available fire hose, the lower end of which is closed by a suitable flat metal fitting (not shown), and the upper end of which is a water pump for pressurizing and supplying water. (Not shown).

In this way, the two hollow long cylinders 2 into which the pressurized fluid filling long cylinder 3 is inserted are fixed to the side wall of the caisson 5 at intervals, and then the caisson 5 is submerged in the sea, and adjacent to each other at a predetermined joint interval. The caisson 5 'is laid down. At this time, the long cylinder 2a for primary water stop, the long cylinder 2b for secondary water stop and the long cylinder 3 for pressurized fluid filling of each hollow long cylinder 2 fixed to the caisson 5 are crushed by water pressure as shown in FIG. It is in a state of flattening.

Next, seawater is injected into the primary water-stopping long tube 2a to inflate the long tube 2a, and then concrete 9 is injected and filled thereinto, thereby obtaining the third
As shown in the drawing, a part of the outer surface of the primary water-stop long cylinder 2a and a part of the outer surface of the secondary water-stop long cylinder 2b are brought into contact with the opposing side wall surface 5a 'of the caisson 5'.

After that, the upper end of the pressurized fluid filling long cylinder 3 is connected to a water supply pump, and the water supply pump is driven to pressurize water into the long cylinder 3 to expand the long cylinder 3 so that the length for the secondary water stoppage is increased. The outer surface of the cylinder 2b is pressed against the side wall 5a 'of the caisson 5'. When the water injection into the long cylinder 3 is completed, the upper end of the long cylinder 3 is sealed with a metal fitting or other appropriate means, and removed from the water pump.

Thus, the two hollow long tubes 2, 2 are connected to the side wall 5 of the caisson 5 '.
a 'hollow and hollow concrete after solidifying concrete 9
By extracting the seawater in the joint between two or two, or by inserting a tremy tube into the seawater in this joint, asphalt mastic (a mixture of asphalt, stone powder and sand together with the additive The material having fluidity by heating and stirring) is filled and solidified to form the impermeable layer 4.

In this way, the sealing structure by the hollow long cylinders 3, 3 and the water-impermeable layer 4 is completed. However, when the caisson 5, 5 'moves relatively and the joint is opened, it is placed in the secondary water stopping long cylinder 2b. The seal is maintained by charging sand or concrete, and replenishing asphalt mastic in the case of lack of asphalt mastic in the impermeable layer 4.

〔The invention's effect〕

As described above, according to the present invention, with the above configuration, the hollow long cylinder fixed to the side wall of one caisson has sand,
The outer surface of the hollow long tube comes into contact with the opposite side wall surface of the other caisson by injecting and filling a filler such as asphalt, mortar, etc., and then pressurize and inject a fluid such as water into the long tube for pressurized fluid filling. As a result, the long cylinder for pressurized fluid filling swells, and the outer surface of the hollow long cylinder presses against the opposite side wall surface of the other caisson by the swelling pressure, so that an extremely strong seal can be obtained. And since the commercially available hose can be used for the long cylinder for pressurized liquid filling, construction can be performed at low cost.

In one embodiment of the present invention, a plurality of hollow long cylinders are fixed at intervals from each other along the side wall of the caisson, and after filling each hollow long cylinder with a filler in the same manner as described above, each pressurization is performed. The outer surface of each hollow long tube is pressed against the other side wall surface of the caisson by injecting a fluid into the long tube for fluid filling under pressure, and then asphalt mastic or the like is inserted into the joint between the hollow long tubes. Since the water-impermeable layer is formed by injecting and filling the filler, multiple seals are formed by the plurality of hollow long cylinders and the water-impermeable layer, and a more reliable seal structure is obtained.

In another embodiment of the present invention, the hollow long cylinder is fixed to a first long cylinder fixed to a side wall of one caisson and a surface of the first long cylinder facing the side wall of the other caisson. Since the long cylinder for pressurized fluid filling is inserted into the second long cylinder, the first long cylinder is filled with a filler such as sand, asphalt, and mortar. If the joint between caisson opens for some reason after a while, sand, asphalt,
By filling with a filler such as mortar and, if necessary, additionally filling the water-impermeable layer with asphalt mastic or the like, sealing can be performed in accordance with the expansion of the joint spacing that occurs after the joint is completed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a completed state of the joint material according to one embodiment of the present invention, with a caisson partially cut away, FIG. 2 is a plan sectional view showing a state where a hollow long cylinder is attached to the caisson, FIG. 3 is a cross-sectional plan view showing a state in which the hollow long cylinder is filled with a filler. DESCRIPTION OF SYMBOLS 1 ... Joint material 2 ... Hollow long cylinder 3 ... Long cylinder for pressurized fluid filling 4 ... Impermeable layer 9 ... Filler

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-295907 (JP, A) JP-A-61-95126 (JP, A) JP-A-61-172907 (JP, A) JP-A 57-95 66212 (JP, A)

Claims (4)

(57) [Claims] 1. A hollow elongated cylinder made of a flexible material and having an open upper end and a closed lower end, the upper end of which is made of a flexible material and connected to a pressurized fluid supply source such as pressurized water has an open upper end. A long cylinder for pressurized fluid filling with other parts closed is provided in a state in which fluid such as water is not injected, and this hollow long cylinder is fixed to one side wall of an adjacent caisson, and sand, After injecting and filling a filler such as asphalt or mortar, a fluid such as water is pressure-injected into the pressurized fluid filling long cylinder, and the pressurized fluid filling long cylinder is bulged out of the hollow long cylinder. A method for applying a joint material for caisson, wherein the surface is pressure-bonded to an opposing side wall surface of the other caisson. 2. A plurality of hollow elongated cylinders made of a flexible material and having an open upper end and a closed lower end are each made of a flexible material and connected to a pressurized fluid supply source such as pressurized water. A long cylinder for pressurized fluid filling, whose upper end is open and other parts are closed, is provided in a state in which a fluid such as water is not injected, and the hollow long cylinders are spaced from each other along one side wall of an adjacent caisson. Is placed and fixed, and each hollow long cylinder is filled with a filler such as sand, asphalt, and mortar, and then a fluid such as water is pressure-injected into each pressurized fluid filling long cylinder, and the pressurized fluid filling length is filled. The outer surface of the hollow long tube is pressed against the opposite side wall surface of the other caisson by expanding the tube, and then a filler such as asphalt mastic is injected and filled into joints between the hollow long tubes. Joint material for caisson characterized by forming an impermeable layer Construction methods. 3. The hollow long cylinder has a first long cylinder fixed to a side wall of one caisson and a second long cylinder fixed to a surface of the first long cylinder facing the side wall of the other caisson. 3. The method according to claim 1, wherein the long cylinder for filling a pressurized fluid is inserted into the second long cylinder. 4. The method according to claim 1, wherein the long cylinder for filling the pressurized fluid is a fire hose.